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| X-Ray & CT Exposure Measurement Instrument. |
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Introduction The Model 660 instrument is the optimum choice for flexibility in x-ray and computed tomography (CT) exposure measurement. The Model 660 consists of a readout, carrying case, and choice of four optional ion chamber based probes with built-in calibrations, allowing interchangeability to customize the instrument to a particular measurement requirement. The Model 660 instrument is suitable for use for energies ranging from mammography through 1.3 MeV. The Model 660 Measurement readout is part of a complete x-ray and CT exposure measurement instrument which saves time and effort during routine diagnostic quality assurance measurements. This portable and light weight readout unit with large three digit LED display can be used with any of the four optional interchangeable ion chamber based probes to cover a range of 1.0 µR to 100 R in the exposure mode and 0.1 mR/min to 1000 R/min in the rate mode. The Model 660 readout may be line operated or powered by NiCad rechargeable batteries. Each Model 660 Series ion chamber based probe contains an electrometer that permits probe calibration independent of the readout. The ion chamber current signal is then digitized, and this digital signal is then transmitted over the cable to the readout resulting in a virtually noise free transmission of data, unaffected by cable length or stress. Cables are available up to 250 feet (about 76 meters). Applications |
| The Model 660 X-Ray & CT Exposure Measurement Instrument is suitable for in-beam and scatter exposure and exposure rate
measurements of diagnostic x-ray beams, mammographic range x-ray machines, as well as CT output measurements, depending
on the ion chamber based probe(s) selected. The ease of portability of this instrument makes it an excellent choice for
measurements necessary in maintaining a diagnostic quality assurance program for several machines and modalities. Specifications Range 3-decade auto-ranging and auto indicating with proper decimal placement and measurement units. See selected ion chambers’ specifications for specific ranges Calibration Unnecessary. Response depends on frequency of internal crystal oscillator (± 0.01% from 10° to 40°C) Accuracy Depends only on crystal oscillator frequency in Exposure Rate mode. See selected probe’s specifications for measurement accuracy Controls Function switch: selects off, total exposure or exposure rate modes. Reset switch: selects run, stop, or reset (in Total Exposure Mode). Intensity knob: controls readout brightness. Error prevention logic Low battery - auto turnoff; Over Range indicator; Excessive intensity indicator; Probe disconnected indicator Display 3-digit LED legends; R/min, R/hr, mR/hr, R, mR, mSv/min, mSV/h, mSv, μSv Battery life 6 hours between charges at 20°C with normal usage. Automatic shutoff when charge drops below usable level Battery complement One 67.5 V collecting potential (shelf-life) and 4 rechargeable 1.25 V “D” batteries for instrument power Battery charge time 10 hours to full recharge at 20°C (instrument OFF) AC recharge input 117 V ± 15% 50/60 Hz power cord furnished 230 V ± 15% available on special order Dimensions 5.50 (w) x 8.50 (d) x 4.50 in (h) (14 x 21.6 x 11.4 cm) Weight 7 lb (3.2 kg) net Accessories supplied Foam-lined carrying “brief” case, 2 and l0 ft ion chamber cables, AC recharging cable, instruction and maintenance manual, probe (to fit in case) available separately |
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